Actress Amanda Seyfried has no problems stripping off to shoot steamy sex scenes, insisting it's "fun" to pretend to romp with her male co-stars.

The blonde beauty has admitted she enjoys on-set clinches after hooking up with hunky actors including Channing Tatum for Dear John and Justin Timberlake in their upcoming sci-fi thriller In Time.

She tells W magazine, "Sex scenes are great. A lot of my co-stars have been sexy guys my age, and so, why not? I'm not going to pretend it's not fun.

"Justin was great - he had come from doing Friends With Benefits, where he basically had sex every day at work - and so it was easy for both of us."

But Seyfried's favorite kiss was actually a same-sex smooch with Megan Fox in Jennifer's Body.

She adds, "Jennifer's Body is my favorite movie that I've done. It was overlooked in theaters, but it does have a DVD following. I can't believe nobody wanted to see Megan Fox and me hitting it. They had an extreme close-up of our tongues, and I'm telling you, the thing about the scene is that it's actually really sexy.

"For a young girl to say that about her own sex scene - it must be because it's special. I think Megan and I kissed really well together. We have similar kissing styles and it worked. We got it done for the masses, and the masses still didn't show up."